Visual Studio 2015单元测试不一致性

在VS2013上移动到VS2015后，我收到不一致的单元测试结果。在VS2013上，单元测试始终通过。在VS2015中，如果所有单元测试同时运行或者是自动Jenkins构建，则单元测试会失败。如果单元测试单独运行，或者所有失败的测试同时运行，则它们通过。

这可能是一个EF6问题。当运行所有测试时，我收到的错误消息是…

Test Name:  GetQuoteService_NoExceptions
Test FullName:  MEA.SmartApp.Business.Factories.APV.UnitTests.QuoteFactoryTest.GetQuoteService_NoExceptions
Test Source:    C:'MetLife_Sourcecode'Common'DEV2'MEA.Smartapp.Common'Unit Tests'MEA.SmartApp.Business.Factories.APV.UnitTests'QuoteFactoryTest.cs : line 15
Test Outcome:   Failed
Test Duration:  0:00:00.00737

Result StackTrace:

at System.Data.Entity.Infrastructure.DependencyResolution.ProviderServicesFactory.GetInstance(String providerTypeName, String providerInvariantName)
   at System.Data.Entity.Internal.AppConfig.<.ctor>b__2(ProviderElement e)
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at System.Data.Entity.Internal.AppConfig.<.ctor>b__1()
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at System.Lazy`1.get_Value()
   at System.Data.Entity.Internal.AppConfig.get_DbProviderServices()
   at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.RegisterDbProviderServices()
   at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.GetServiceFactory(Type type, String name)
   at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.<>c__DisplayClass1.<GetService>b__0(Tuple`2 t)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.GetService(Type type, Object key)
   at System.Data.Entity.Infrastructure.DependencyResolution.DbDependencyResolverExtensions.GetServiceAsServices(IDbDependencyResolver resolver, Type type, Object key)
   at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.GetServices(Type type, Object key)
   at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.<>c__DisplayClass6.<GetServices>b__5(IDbDependencyResolver r)
   at System.Linq.Enumerable.<SelectManyIterator>d__1`2.MoveNext()
   at System.Linq.Enumerable.<ConcatIterator>d__1`1.MoveNext()
   at System.Linq.Enumerable.<OfTypeIterator>d__1`1.MoveNext()
   at System.Data.Entity.Utilities.IEnumerableExtensions.Each[T](IEnumerable`1 ts, Action`1 action)
   at System.Data.Entity.Infrastructure.DependencyResolution.InternalConfiguration.Lock()
   at System.Data.Entity.Infrastructure.DependencyResolution.DbConfigurationManager.<.ctor>b__1()
   at System.Lazy`1.CreateValue()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Lazy`1.get_Value()
   at System.Data.Entity.Infrastructure.DependencyResolution.DbConfigurationManager.GetConfiguration()
   at System.Data.Entity.DbContext.InitializeLazyInternalContext(IInternalConnection internalConnection, DbCompiledModel model)
   at System.Data.Entity.DbContext..ctor(String nameOrConnectionString)
   at MEA.SmartApp.Contexts.APV.AVMDB..ctor() in C:'MetLife_Sourcecode'Common'DEV2'MEA.Smartapp.Common'DataAccessLayer'MEA.SmartApp.Contexts.APV'AVMDB.Context.cs:line 19
   at MEA.SmartApp.Business.Factories.APV.QuoteFactory.GetAvmBusinessService() in C:'MetLife_Sourcecode'Common'DEV2'MEA.Smartapp.Common'BusinessLogicLayer'MEA.SmartApp.Business.Factories.APV'QuoteFactory.cs:line 65
   at MEA.SmartApp.Business.Factories.APV.QuoteFactory.GetQuoteService(APVTransactionCode transactionCode) in C:'MetLife_Sourcecode'Common'DEV2'MEA.Smartapp.Common'BusinessLogicLayer'MEA.SmartApp.Business.Factories.APV'QuoteFactory.cs:line 46
   at MEA.SmartApp.Business.Factories.APV.UnitTests.QuoteFactoryTest.GetQuoteService_NoExceptions() in C:'MetLife_Sourcecode'Common'DEV2'MEA.Smartapp.Common'Unit Tests'MEA.SmartApp.Business.Factories.APV.UnitTests'QuoteFactoryTest.cs:line 18
Result Message: 
Test method MEA.SmartApp.Business.Factories.APV.UnitTests.QuoteFactoryTest.GetQuoteService_NoExceptions threw exception: 
**System.InvalidOperationException: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded**. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.

*我意识到这不是一个真正的单元测试，因为它试图连接到一个数据库，所以如果你有任何建议如何修复，让我知道。